Open AccessAgitation of Complex Fluids in Cylindrical Vessels by Newly Designed Anchor Impellers
Author(s) -
Kada Benhanifia,
Lakhdar Rahmani,
Brahim Mebarki,
Houari Ameur
Publication year - 2022
Publication title -
periodica polytechnica. mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.259
H-Index - 16
eISSN - 1587-379X
pISSN - 0324-6051
DOI - 10.3311/ppme.18438
Subject(s) - impeller , shearing (physics) , bingham plastic , power consumption , agitator , mechanics , reynolds number , expansive , materials science , mechanical engineering , power (physics) , engineering , rheology , turbulence , physics , geotechnical engineering , composite material , thermodynamics , compressive strength
The fluid flows and power consumption in a vessel stirred by anchor impellers are investigated in this paper. The case of rheologically complex fluids modeled by the Bingham-Papanastasiou model is considered. New modifications in the design of the classical anchor impeller are introduced. A horizontal blade is added to the standard geometry of the anchor, and the effect of its inclination angle (α) is explored. Four geometrical configurations are realized, namely: α = 0°, 20°, 40°, and 60°. The effects of the number of added horizontal blades, Reynolds number, and Bingham number are also examined. The obtained findings reveal that the most efficient impeller design is that with (case 4) arm blades inclined by 60°.This case allowed the most expansive cavern size with enhanced shearing in the whole vessel volume. The effect of adding second horizontal arm blades (with 60°) gave better hydrodynamic performance only with a slight increase in power consumption. A significant impact of Bingham number (Bn) was observed, where Bn = 5 allowed obtaining the lowest power input and most expansive well-stirred region.